Check valve



Aug. 19, 1947. G. MILLER CHECK VALVE Filed March 10, 1944 INVENTOR.

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ATI'D R N EYE Patented Aug. 19, 19 47 CHECK VALVE George Miller, UnitedStates Army, Hackensack, N. 3-;

Application March 10, 1944, Serial No. 525,926

1 Claim. 1

My invention relates to valves, and has among its objects and advantagesthe provision of an improved check valve.

An object of my invention is to provide a check or vacuum valve of novelconstruction which may be easily attached to a conventional steamradiator air venting valve in lieu of the usual cap, and in which thevalve construction is such as to open in response to slight pressure forair venting purposes, but in which the valve seats strongly in responseto slight or great external pressure to prevent entry of air into thesystem.

In the accompanying drawings:

Figure 1 is a side View of the valve.

Figure 2 is an end View.

Figure 3 is an enlarged sectional view, and

Figure 4 is a sectional view along the line 4 of Figure 3.

In the embodiment of the invention selected for illustration, I make useof a valve body Ill provided with a threaded bore II for connection witha conventional air vent valve of a steam radiator. This body includes anannular wall I2 defining a chamber I3 of larger diameter than thethreaded bore II. The wall I2 is provided with a fiat end face I4constituting a shoulder or support for a flexible diaphragm I5,preferably rubber.

A seat body I6 is threaded partly in the bore I I and i provided with aslightly convexed face or seat I? having its highest point lyingsubstantially fiush with the end face I4, so that the diaphragm I5touches the seat when flat, as in Figure 3. A small air venting openinI8 is pro vided in the diaphragm I5, which opening is located coaxiallyof the seat I'I so as to be closed thereby when the diaphragm is in thenormal position of Figure 3.

Means for fixedly securing the diaphragm to the valve body It) comprisesa cap I9 having an annular shoulder 29 for clamping the diaphragm to theend face It. An annular flange 2I is provided on the cap I9 to fit overthe open end of the annular wall I2. The flange 2| is slotted axially at22 to divide part of the flange 2I into cap latching fingers 23 fordetachably connecting the cap I9 with the valve body I 3. These fingersare flexible and bear against the outer face of the wall I2.

A circumferential groove 24 is provided in the outer face of the walll2, and the fingers 23 are formed with detents 25 which snap into thegroove 2d when the cap I9 is pressed onto the valve body to clamp thediaphragm against the end face It to seal the edge margin of thediaphragm. The clamping pressure on the diaphragm is sumcient to preventslippage between the face It and the shoulder 20, but the pressure isnot too great, since excessive pressure causes objectionable distortionof the diaphragm.

A lug 26 projects from the outer face of the wall l2 and is receivablein a slot 2'! in the flange 2i to restrain the cap I9 from rotationrelatively to the wall i2. Because of the lug 26, the cap I9 can bemoved axially only on the wall I2, which prevents distortion of thediaphragm incident to any relative rotation of the clamping parts.

The body I6 preferably comprises brass or other suitable material whichprevents sticking of the diaphragm i5. An axial passage 28 is made inthe body It, which passage places the bore I I in communication with thechamber I3 through the medium of branch ports 29 in the body I6. Ports33 are provided in the cap I9 to place the cap chamber 3| incommunication with the atmosphere. A flange 32 on the cap I9 overhangsthe ports 39 to act as a duct shield.

The diaphragm I5 is highly sensitive to pressure, so that a slightpressure opens or closes the opening I8, depending upon the direction ofthe pressure.

All the rigid parts of the valve may comprise metal or plastic, asdesired.

Without further elaboration, the foregoing will so fully explain myinvention, that others may, by applying current knowledge, readily adaptthe same for use under various conditions of service.

I claim:

A check valve of the type described comprising a body having a pressureinlet chamber provided with a shoulder, and a bore of smaller diameterthan said chamber for connection with a pressure supply means, a caphaving outlet means and a pressure outlet chamber and provided with asecond shoulder, a valve seat in said inlet chamber threaded into saidbore and provided with a convex face and further provided with ports forplacing the bore in communication with said pressure inlet chamber, theshoulder of said pressure inlet chamber lying substantially in a planeat the highest point of said convexed face, a diaphragm having its edgemargin positioned between said first and second shoulders and providedwith an opening normally closed by the convexed face of said seat, saiddiaphragm separating said pressure inlet chamber from said pressureoutlet chamber, with the two chambers having communication only whensaid diaphragm is lifted off said seat by pressure in said pressureinlet chamber, a slot in said cap and a lug on REFERENCES CITED Thefollowing references are of record in the file of this patent:

Number Number UNITED STATES PATENTS Name Date Amos June 10, 1930 BeckJan. 27, 1891 Wolter Dec, 27, 1927 Cantor Oct, 26, 1943 Keenan June 17,1924 Mintz Mar, 30, 1915 Locke Mar. 9, 1879 Shindel Feb. 5, 1929 FOREIGNPATENTS Country Date Great Britain Aug. 29, 1901 Italy Oct. 15, 1930

